Current File : //snap/core22/2111/lib/python3/dist-packages/attr/__pycache__/converters.cpython-310.pyc
o
��`� � @ sn d Z ddlmZmZmZ ddlmZ ddlmZm Z m
Z
es&ddl Z ddl Z g d�Z
dd � Zedfd
d �ZdS ) z
Commonly useful converters.
� )�absolute_import�division�print_function� )�PY2)�NOTHING�Factory�pipeN)r �optional�default_if_nonec s� � fdd�}t sLd}zt�� �}W n ttfy Y nw |rLt|j�� �}|r<|d jtj j
ur<t j |d j |j
d< |jtjj
urLt j |j |j
d< |S )aO
A converter that allows an attribute to be optional. An optional attribute
is one which can be set to ``None``.
Type annotations will be inferred from the wrapped converter's, if it
has any.
:param callable converter: the converter that is used for non-``None``
values.
.. versionadded:: 17.1.0
c s | d u rd S � | �S �N� ��val�� converterr
�1/usr/lib/python3/dist-packages/attr/converters.py�optional_converter% s z$optional.<locals>.optional_converterNr r �return)r �inspect� signature�
ValueError� TypeError�list�
parameters�values�
annotation� Parameter�empty�typing�Optional�__annotations__�return_annotation� Signature)r r �sig�paramsr
r r r
s& �
�
�r
c sx � t u r |du r td��� t ur|durtd��|dur t|�� t� t�r4� jr,td��� fdd�}|S � fdd�}|S )a�
A converter that allows to replace ``None`` values by *default* or the
result of *factory*.
:param default: Value to be used if ``None`` is passed. Passing an instance
of `attr.Factory` is supported, however the ``takes_self`` option
is *not*.
:param callable factory: A callable that takes no parameters whose result
is used if ``None`` is passed.
:raises TypeError: If **neither** *default* or *factory* is passed.
:raises TypeError: If **both** *default* and *factory* are passed.
:raises ValueError: If an instance of `attr.Factory` is passed with
``takes_self=True``.
.. versionadded:: 18.2.0
Nz(Must pass either `default` or `factory`.z5Must pass either `default` or `factory` but not both.z1`takes_self` is not supported by default_if_none.c s | d ur| S � � � S r )�factoryr ��defaultr
r �default_if_none_convertera s z2default_if_none.<locals>.default_if_none_converterc s | d ur| S � S r r
r r' r
r r) i s )r r r �
isinstance�
takes_selfr )r( r& r) r
r' r r > s" �
� �r )�__doc__�
__future__r r r �_compatr �_maker r r r r �__all__r
r r
r
r
r �<module> s '
Mini Shell